package com.zjj.reggie.controller;


import com.zjj.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private  String bassPath;

    /**
     * 文件上传
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，需要保存到指定位置
        log.info("上传文件：{}", file.toString());
        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //获取文件后缀
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重命名文件
        String fileName = UUID.randomUUID().toString()+suffix;
        //创建一个目录
        File dir = new File(bassPath);
        //判断目录是否存在，不存在则创建
        if (!dir.exists()) {
            dir.mkdirs();
        }

        try {
            file.transferTo(new File(bassPath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }



    /**
     * 文件下载
     */
    @GetMapping("/download")
    public void download( String name, HttpServletResponse response) {

        try {
            //输入流，读取文件
            FileInputStream fileInputStream = new FileInputStream(new File(bassPath+name));
            //输出流，将文件写入到浏览器
            ServletOutputStream outputStream = response.getOutputStream();


            response.setContentType("image/jpeg");//设置上传文件的类型

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes) )!= -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭流
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }




    }
}
